Bull Lake is a lake in geographic Devonshire Township in the municipality of Sioux Narrows-Nestor Falls, Kenora District, Ontario, Canada. It is about 570 metres (1,870 ft) long and 260 metres (853 ft) wide, and lies at an elevation of 358 metres (1,175 ft) about 15 kilometres (9.3 mi) northeast of the community of Sioux Narrows.